Composite artificial fish reef device

Abstract

The invention discloses a composite type artificial fish reef device. The artificial fish reef device comprises a conical barrel (2), a main body air curtain generation pipe fitting (3) and a compressed gas supply source, the conical barrel comprises a barrel body (21); a flow inlet pipe opening (212) is formed in the position, close to the lower barrel opening, of the barrel body, and a spiral flow guide groove (211) is formed in the inner circumferential face of the barrel body. A flow gathering hopper (23) is assembled aiming at the flow inlet pipe orifice; the main air curtain generating pipe fitting is arranged on the inner side of the conical barrel, and the compressed air supply source provides compressed air for the main air curtain generating pipe fitting. When the water flow speed is high, substances such as nutritive salt and the like are raised to a high height in a relaying mode that the substances such as the nutritive salt and the like are thrown out from the uppermost end of the spiral flow guide groove in the conical barrel and the substances such as the thrown-out nutritive salt and the like are further raised by air curtain upward flow generated by the main body air curtain generation pipe fitting.

Description

Technical Field

[0001] The present invention relates to an artificial fish reef, and more particularly to a composite artificial fish reef device. Background Art

[0002] The existing composite fish reef with automatic adjustment of upwelling is a method of optimizing the working limitations of traditional upwelling by changing the way of generating upwelling.

[0003] Traditional artificial fish reefs are divided into value-added artificial fish reefs, wave-dissipating artificial fish reefs, algal bed artificial fish reefs, etc., which have disadvantages such as single function and small space utilization rate, and cannot utilize the upper area of the artificial fish reef. The air curtain upwelling generated by the traditional method has a narrow working range and cannot function at higher seawater flow rates.

[0004] In summary, the problems to be solved by the present invention are as follows:

[0005] The traditional air curtain upwelling can achieve the expected working purpose at lower seawater flow rates, but cannot function at higher seawater flow rates.

[0006] Specifically, at lower seawater flow rates, the traditional air curtain upwelling can deliver the nutrients at the seabed to the expected seawater height through bubbles and can function at this time. However, when the seawater flow rate is too high, the large cross-flow may cause the nutrient plume and the bubble group to separate prematurely and sink to the bottom under the action of gravity, thereby weakening the vertical transport capacity of the water body, preventing the nutrients from reaching the expected seawater height, and causing the traditional air curtain upwelling to lose its function. Summary of the Invention

[0007] The purpose of the present invention is to provide a composite artificial fish reef device, which can also make substances such as nutrients rise to a higher height when the water flow rate is large.

[0008] In order to achieve the above technical purpose, the present invention adopts the following technical solutions:

[0009] A composite artificial fish reef device, the artificial fish reef device is arranged at the bottom of the water, and the artificial fish reef device includes a conical cylinder, a main body air curtain generating pipe fitting and a compressed gas supply source; the conical cylinder is based on the bottom of the water, and the conical cylinder includes a cylinder body; the large-diameter cylinder mouth of the cylinder body faces upward, and the small-diameter cylinder mouth of the cylinder body faces downward; an inlet pipe orifice is arranged at a position near the lower cylinder mouth of the cylinder body, and a spiral guide groove is arranged on the inner circumferential surface of the cylinder body, and the spiral guide groove starts from the inlet pipe orifice and spirally rises to the edge of the upper cylinder mouth of the cylinder body; a flow concentrating hopper is assembled for the inlet pipe orifice, and the flow concentrating hopper is located outside the cylinder body; the main body air curtain generating pipe fitting is arranged inside the conical cylinder, and the compressed gas supply source provides compressed air for the main body air curtain generating pipe fitting.

[0010] Furthermore, the artificial fish reef device further includes a V-shaped baffle, and the V-shaped baffle is arranged on the side facing the confluence hopper.

[0011] Furthermore, there are two inlet flow pipes arranged at the position near the lower barrel opening of the barrel body; there are two spiral diversion grooves arranged on the inner circumferential surface of the barrel body, and the two spiral diversion grooves respectively correspond to the two inlet flow pipes; the number of the V-shaped baffles arranged is two, and the two V-shaped baffles respectively correspond to the confluence hoppers assembled on the two inlet flow pipes.

[0012] Furthermore, an extension plate is arranged on the outer circumferential surface of the barrel body.

[0013] Furthermore, the extension plate starts from the lower part of the barrel body and spirally rises to the upper part of the barrel body to end.

[0014] Furthermore, the artificial fish reef device further includes a main body housing, and the main body housing is arranged outside the conical barrel, and the main body housing shelters the conical barrel therein.

[0015] Furthermore, a small hole dense array is arranged on the main body housing.

[0016] Furthermore, the artificial fish reef device further includes side air curtain generating pipe fittings, and the side air curtain generating pipe fittings are arranged on the side facing the confluence hopper.

[0017] Furthermore, there are two inlet flow pipes arranged at the position near the lower barrel opening of the barrel body; there are two spiral diversion grooves arranged on the inner circumferential surface of the barrel body, and the two spiral diversion grooves respectively correspond to the two inlet flow pipes; the number of the V-shaped baffles arranged is two, and the two V-shaped baffles respectively correspond to the confluence hoppers assembled on the two inlet flow pipes; the number of the side air curtain generating pipe fittings included in the artificial fish reef device is two, and the two side air curtain generating pipe fittings respectively correspond to the confluence hoppers assembled on the two inlet flow pipes.

[0018] Furthermore, a main body air curtain control valve is arranged for the main body air curtain generating pipe fitting, and a side air curtain control valve is arranged for the side air curtain generating pipe fitting.

[0019] The main beneficial effects of the artificial fish reef device of the present invention compared with the prior art are as follows:

[0020] When using the artificial fish reef device of the invention, when the water flow velocity is relatively large, the way of "spraying out nutrients and other substances at the uppermost end of the spiral diversion groove in the conical barrel" and "the air curtain upwelling generated by the main body air curtain generating pipe fitting further raising the height of the sprayed-out nutrients and other substances" is adopted in relay to make the nutrients and other substances rise to a relatively high specific water layer height to meet the requirements of actual applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 FIG. is a schematic diagram of the overall external structure of the composite artificial reef device of the present invention;

[0022] Figure 2 FIG. is a schematic diagram of the overall explosion of the artificial reef device of the present invention;

[0023] Figure 3 FIG. is a schematic diagram of the structure of the conical cylinder in the artificial reef device of the present invention;

[0024] Figure 4 FIG. is an oblique side view of the conical cylinder in the artificial reef device of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following further describes the specific embodiments of the present invention:

[0026] This embodiment provides a composite artificial reef device, which is installed at the bottom of the target water area. Its basic function is to simulate real underwater reefs and provide a good living environment for marine organisms.

[0027] Refer to Figure 1 and Figure 2 , the artificial reef device of this embodiment includes a main body housing 1, a conical cylinder 2, a main body air curtain generating pipe fitting 3, an air delivery pipe 4, a V-shaped baffle 5 and a side air curtain generating pipe fitting 6.

[0028] The conical cylinder 2 can be installed based on the seabed, riverbed or other underwater base parts.

[0029] Refer to Figure 3 and Figure 4 , the conical cylinder 2 mainly includes a cylinder body 21 and a cylinder base 22.

[0030] The cylinder body 21 is arranged in an upright state. The large-diameter cylinder mouth of the cylinder body 21 faces upward, and the small-diameter cylinder mouth of the cylinder body 21 faces downward. That is to say, the upper cylinder mouth of the cylinder body 21 is the large-diameter cylinder mouth, and the lower cylinder mouth of the cylinder body 21 is the small-diameter cylinder mouth.

[0031] At a position near the lower cylinder mouth of the cylinder body 21, two inflow pipe orifices 212 are provided. These two inflow pipe orifices 212 are arranged axially symmetrically on the cylinder body 21 (with the central axis of the cylinder body 21 as the axis of symmetry). The inflow pipe orifices 212 communicate the inside and outside of the cylinder body 21.

[0032] On the inner circumferential surface of the cylinder body 21, two spiral guide grooves 211 are provided. Both of these two spiral guide grooves 211 start from the lower cylinder mouth of the cylinder body 21 and extend all the way to the edge of the upper cylinder mouth of the cylinder body 21.

[0033] Specifically,

[0034] For a single spiral guide groove 211 , one end of the spiral guide groove 211 is located at an inlet pipe opening 212 provided at the lower tube opening of the tube body 21 , and the other end of the spiral guide groove 211 is located at the edge of the upper tube opening of the tube body 21 .

[0035] The two spiral guide grooves 211 correspond to the two inlet pipe openings 212 mentioned above respectively.

[0036] The spiral guide groove 211 is spirally ascending on the inner circumference of the barrel body 21. That is, the spiral guide groove 211 starts from the inlet pipe opening 212 at the lower barrel opening of the barrel body 21 and spirally ascends to the edge of the upper barrel opening of the barrel body 21.

[0037] On the inner circumference of the barrel body 21, two spiral guide grooves 211 are coordinated and combined together without intersecting or interfering with each other. Alternatively, the two spiral guide grooves 211 can be called "double spiral guide grooves".

[0038] It should be noted that, as mentioned above, one end of the spiral guide groove 211 is located at the inlet pipe opening 212 provided at the lower barrel opening of the barrel body 21 , that is, the spiral guide groove 211 is connected to the inlet pipe opening 212 .

[0039] Two flow-gathering buckets 23 are also provided on the barrel body 21 . The two flow-gathering buckets 23 are provided outside the barrel body 21 . The two flow-gathering buckets 23 are provided for the two aforementioned inlet pipe openings 212 . The two flow-gathering buckets 23 are respectively mounted on the two inlet pipe openings 212 .

[0040] As for a single flow-collecting funnel 23, it is in the shape of a funnel as a whole, and its funnel mouth is called a flow-collecting mouth.

[0041] The directions of the flow concentrators of the two flow concentrators 23 are opposite to each other. The purpose of such arrangement is to receive the impact of water flows in two opposite directions.

[0042] In addition, an extension plate 213 is provided on the outer peripheral surface of the barrel body 21 . The extension plate 213 is in the shape of a spiral plate as a whole. The extension plate 213 starts from the lower part of the barrel body 21 and spirally rises to the upper part of the barrel body 21 and ends.

[0043] The outer plate 213 is used to receive the nutrients that are lifted to a high place by the upwelling of the air curtain and then settle down. Marine organisms will gather on the outer plate 213. The outer plate 213 creates a good environment for these gathered marine organisms to live in, providing them with a place to reproduce, grow, feed and shelter from enemies.

[0044] The cylinder base 22 is fixedly connected to the lower end (lower cylinder opening) of the cylinder body 21, and the cylinder body 21 (or the entire conical cylinder 2) is installed based on the underwater base through the cylinder base 22.

[0045] The main body housing 1 has an overall configuration like a square tower. The main body housing 1 is arranged outside the conical cylinder 2 and acts as a shield to cover the conical cylinder 2 therein.

[0046] The main body housing 1 is also installed based on the seabed, riverbed or other underwater bases, so as to cover the conical cylinder 2 therein, to prevent the conical cylinder 2 from being invaded by foreign objects and to prevent the conical cylinder 2 from capsizing when the seawater flow rate is too high.

[0047] The main body housing 1 is covered with numerous small holes, and these small holes together form a "dense array of small holes". The function of this dense array of small holes is to allow substances such as nutrients to enter the interior of the main body housing 1 through the small holes and then deposit on the epitaxial plate 213.

[0048] It should be noted that the "bubbling pipeline" mentioned in this article refers to: a pipeline that is integrally closed, with numerous air outlet small holes opened on the pipeline. Connect such a pipeline to a compressed gas supply source and place it in the water body. The compressed gas provided by the compressed gas supply source can be discharged from the air outlet small holes on the bubbling pipeline, so as to form a large number of floating small bubbles in the water body.

[0049] The main body air curtain generating pipe fitting 3 has a plurality of annular bubbling pipelines 31 and a gas guide pipe 32. The plurality of annular bubbling pipelines 31 are arranged in concentric circles, and the gas guide pipe 32 is connected to the plurality of annular bubbling pipelines 31 through some branch pipelines.

[0050] The main body air curtain generating pipe fitting 3 is arranged inside the cylinder body 21 of the conical cylinder 2, and the annular bubbling pipelines 31 of the main body air curtain generating pipe fitting 3 are at the upper cylinder opening of the cylinder body 21. The gas guide pipe 32 of the main body air curtain generating pipe fitting 3 extends to the lower part of the entire conical cylinder 2 through the lower cylinder opening of the cylinder body 21 and then is connected to the gas transmission pipe 4 (see details later).

[0051] The number of the side air curtain generating pipe fittings 6 is two.

[0052] For a single side air curtain generating pipe fitting 6, the side air curtain generating pipe fitting 6 has a plurality of straight bubbling pipelines 61 and a gas guide pipe 62. The plurality of straight bubbling pipelines 61 are arranged parallel to each other, and the gas guide pipe 62 is connected to the plurality of straight bubbling pipelines 61.

[0053] Two side air curtain generating pipe fittings 6 are respectively arranged on both sides facing the two converging hoppers 23 of the conical cylinder 2, and the side air curtain generating pipe fittings 6 are buried in the seabed surface layer. The air guide pipes 62 of the two side air curtain generating pipe fittings 6 are both connected to the air transmission pipe 4 (see the following text for details).

[0054] The air transmission pipe 4 is arranged below the conical cylinder 2. The air transmission pipe 4 is in a horizontal state below the conical cylinder 2, and the air transmission pipe 4 is buried in the seabed surface layer. The air transmission pipe 4 has a plurality of pipe orifices, and these pipe orifices are used to communicate with other pipeline devices.

[0055] The air guide pipe 32 of the main air curtain generating pipe fitting 3 mentioned before is connected to a pipe orifice on the air transmission pipe 4 (as indicated by the arrow A in Figure 2 ). The air guide pipes 62 of the two side air curtain generating pipe fittings 6 mentioned before are both connected to the pipe orifices on the air transmission pipe 4.

[0056] In addition, it should be noted that for the artificial reef device of this embodiment, a compressed gas supply source (not shown in the figure) is also pre-equipped. The compressed gas supply source is also connected to the pipe orifice on the air transmission pipe 4 (as indicated by the arrows B1 and B2 in Figure 2 ), so that compressed air can be provided for the main air curtain generating pipe fitting 3 and the side air curtain generating pipe fitting 6 through the air transmission pipe 4.

[0057] It should be noted that in the air transmission pipe 4, control valves (not shown in the figure, specifically arranged at the connected pipe orifices) are provided for the main air curtain generating pipe fitting 3 and the two side air curtain generating pipe fittings 6. By controlling these control valves, the start and stop control of "the main air curtain generating pipe fitting 3 and the side air curtain generating pipe fitting 6 generate air curtain upwelling" can be realized. Therefore, these control valves can also be called air curtain control valves.

[0058] For the convenience of accurate expression,

[0059] the name of the air curtain control valve for controlling the main air curtain generating pipe fitting 3 to generate air curtain upwelling is defined as the main air curtain control valve;

[0060] the name of the air curtain control valve for controlling the side air curtain generating pipe fitting 6 to generate air curtain upwelling is defined as the side air curtain control valve.

[0061] It should be noted that the compressed gas supply source mentioned before generally refers to equipment or pipelines that can provide compressed gas supply.

[0062] The number of the V-shaped baffles 5 is two, and the two V-shaped baffles 5 are respectively arranged on both sides facing the confluence ports of the two confluence hoppers 23 of the conical cylinder 2. For a single V-shaped baffle 5, it is located between the side air curtain generating pipe fitting 6 and the confluence hopper 23. The concave side of the V-shaped baffle 5 faces the side of the side air curtain generating pipe fitting 6, and the arrow protruding side of the V-shaped baffle 5 faces the side of the confluence hopper 23.

[0063] The function of the V-shaped baffle 5 is that when the high-speed water flow is blocked at the V-shaped baffle 5, a strong horseshoe vortex will be generated on the upper side of the V-shaped baffle 5, and this horseshoe vortex can carry substances such as nutrients and flow towards the conical cylinder 2.

[0064] It should be noted that the V-shaped baffle 5 is a component of the prior art, and its specific installation form and function are known to those skilled in the art.

[0065] The artificial fish reef device of this embodiment has the following working principle:

[0066] This artificial fish reef device is usually arranged in the waters near the coast, so that the two confluence hoppers 23 respectively face the "direction of the coast" and the "direction away from the coast". In addition, a water flow speed measuring instrument (not shown in the figure) is configured for the artificial fish reef device of this embodiment, and the previously mentioned air curtain control valve is controlled by this water flow speed measuring instrument.

[0067] When the tide occurs and generates water flow,

[0068] When the water flow speed measuring instrument measures that the water flow is greater than a certain threshold, the main air curtain control valve is controlled to open, and the side air curtain control valve is closed. The main air curtain generating pipe fitting 3 starts to emit bubbles, so as to form an air curtain upwelling above the conical cylinder 2, while the side air curtain generating pipe fitting 6 does not emit bubbles to generate an air curtain upwelling. At this time, there is always one confluence hopper 23 facing the water flow impact.

[0069] The water flow first impacts on the V-shaped baffle 5, thus generating a horseshoe vortex. The generated horseshoe vortex can carry substances such as nutrients on the seabed to churn and rise, and then move towards the conical cylinder 2 along with the water flow and be washed into the confluence hopper 23, and thus enter the spiral diversion groove 211, and finally be sprinkled out at the uppermost end of the spiral diversion groove 211 (that is, the upper edge of the conical cylinder 2). The air curtain upwelling generated by the main air curtain generating pipe fitting 3 further increases the rising height of the sprinkled substances such as nutrients. When rising to the maximum height (predetermined height), the seawater carrying substances such as nutrients will diffuse in this water layer and stay for a long time, providing nutrients for the marine organisms in this water layer. And the substances such as nutrients that are not collected by the confluence hopper 23 will be washed to the outer extension plate 213 and deposited, providing nutrients for the marine organisms inhabiting the outer extension plate 213.

[0070] When there is no obvious water flow in the water area,

[0071] When the water flow speed measured by the water flow velocimeter is less than a certain value, the main air curtain control valve is controlled to close, and the side air curtain control valve is opened. Bubbles start to emerge from the side air curtain generating pipe fitting 6, thereby forming an air curtain upwelling on both sides of the conical cylinder 2, while the main air curtain generating pipe fitting 3 does not bubble to generate an air curtain upwelling.

[0072] Since the side air curtain generating pipe fitting 6 is buried in the seabed surface layer, the air curtain upwelling generated by it will stir and lift substances such as nutrients on the seabed to a certain height. When rising to the maximum height (predetermined height), the seawater carrying substances such as nutrients will diffuse in the water layer at this height and stay for a long time, providing nutrients for the marine organisms in this water layer. And the nutrients and other substances that have not been consumed for a long time will settle to the seabed under the action of their own gravity, and provide nutrients for the marine organisms inhabiting in the artificial reef device.

[0073] In summary, the artificial reef device of this embodiment can simulate real underwater reefs, provide a good habitat environment for marine organisms, and can also expand the working range of the traditional air curtain upwelling, and finally provide technical support for restoring the good ecological environment near the coast.

[0074] The advantages of the artificial reef device of this embodiment are as follows:

[0075] 1) In the artificial reef device of this embodiment, a main air curtain generating pipe fitting 3 is arranged above the conical cylinder 2, and the main air curtain generating pipe fitting 3 is used to form an air curtain upwelling in the upper part of the conical cylinder 2.

[0076] When the water flow speed is relatively large, the method of "spraying substances such as nutrients at the uppermost end of the spiral diversion groove 211 in the conical cylinder 2" and "the air curtain upwelling generated by the main air curtain generating pipe fitting 3 causing the sprayed substances such as nutrients to rise to a higher height" can be used in relay to make the substances such as nutrients rise to a higher height. In this way, the technical problem in the prior art that "when the seawater flow speed is too high, a large cross-flow may cause the nutrient plume and the bubble group to separate prematurely and sink to the bottom under the action of gravity, making the nutrients unable to reach the expected seawater height and causing the traditional air curtain upwelling to lose its effect" is solved.

[0077] 2) In the artificial reef device of this embodiment, side air curtain generating pipe fittings 6 are provided on both sides of the entire artificial reef device. The side air curtain generating pipe fittings 6 are used to form an air curtain upwelling flow on both sides of the conical cylinder 2. When the water flow velocity is not high, the side air curtain generating pipe fittings 6 can be used to lift substances such as nutrients to a specific water layer height. In this way, the artificial reef device of this embodiment can also adopt the traditional air curtain upwelling flow method to turn and lift substances such as nutrients on the seabed.

[0078] In summary, the artificial reef device of this embodiment can handle two situations of "relatively high water flow velocity" and "not high water flow velocity". In both situations, it can sprinkle substances such as nutrients at the bottom of the water to a specific water layer height, so that the artificial reef device of this embodiment can adapt to the water flow environment of various waters, and thus realize its application in a wider range of waters.

[0079] The above are only the preferred embodiments of the present invention, and are not used to limit the protection scope of the present invention. Therefore, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A composite artificial fish reef device, the artificial fish reef device is arranged at the bottom of the water, and is characterized in that: The artificial fish reef device includes a conical cylinder (2), a main body air curtain generating pipe fitting (3), and a compressed gas supply source; The conical cylinder (2) is based on the bottom of the water, and the conical cylinder (2) includes a cylinder body (21); The large-diameter cylinder mouth of the cylinder body (21) faces upward, and the small-diameter cylinder mouth of the cylinder body (21) faces downward; At a position near the lower cylinder mouth of the cylinder body (21), an inflow pipe orifice (212) is provided, and a spiral guide groove (211) is provided on the inner circumferential surface of the cylinder body (21). The spiral guide groove (211) starts from the inflow pipe orifice (212) and spirally ascends to the edge of the upper cylinder mouth of the cylinder body (21); A flow concentrating hopper (23) is assembled for the inflow pipe orifice (212), and the flow concentrating hopper (23) is located outside the cylinder body (21); The main body air curtain generating pipe fitting (3) is arranged inside the conical cylinder (2), and the compressed gas supply source supplies compressed air to the main body air curtain generating pipe fitting (3).

2. The composite artificial fish reef device according to claim 1, characterized in that: The artificial fish reef device further includes a V-shaped baffle (5), and the V-shaped baffle (5) is arranged on the side facing the flow concentrating hopper (23).

3. The composite artificial fish reef device according to claim 2, characterized in that: The number of inflow pipe orifices (212) provided at a position near the lower cylinder mouth of the cylinder body (21) is two; The number of spiral guide grooves (211) provided on the inner circumferential surface of the cylinder body (21) is two, and the two spiral guide grooves (211) respectively correspond to the two inflow pipe orifices (212); The number of V-shaped baffles (5) provided is two, and the two V-shaped baffles (5) respectively correspond to the flow concentrating hoppers (23) assembled on the two inflow pipe orifices (212).

4. The composite artificial fish reef device according to claim 1, characterized in that: An extension plate (213) is provided on the outer circumferential surface of the cylinder body (21).

5. The composite artificial fish reef device according to claim 4, characterized in that: The extension plate (213) starts from the lower part of the cylinder body (21) and spirally ascends to the upper part of the cylinder body (21) and ends.

6. The composite artificial fish reef device according to claim 1, characterized in that: The artificial fish reef device further includes a main body housing (1), and the main body housing (1) is arranged outside the conical cylinder (2), and the main body housing (1) shelters the conical cylinder (2) therein.

7. The composite artificial fish reef device according to claim 6, characterized in that: A small hole dense array is provided on the main body housing (1).

8. The composite artificial fish reef device according to claim 2, characterized in that: The artificial fish reef device further includes a side air curtain generating pipe fitting (6), and the side air curtain generating pipe fitting (6) is arranged on the side facing the flow concentrating hopper (23).

9. The composite artificial fish reef device according to claim 8, characterized in that: The number of inflow pipe orifices (212) provided at a position near the lower cylinder mouth of the cylinder body (21) is two; The number of spiral guide grooves (211) provided on the inner circumferential surface of the cylinder body (21) is two, and the two spiral guide grooves (211) respectively correspond to the two inflow pipe orifices (212); The number of V-shaped baffles (5) provided is two, and the two V-shaped baffles (5) respectively correspond to the flow concentrating hoppers (23) assembled on the two inflow pipe orifices (212); The number of side air curtain generating pipe fittings (6) included in the artificial fish reef device is two, and the two side air curtain generating pipe fittings (6) respectively correspond to the flow concentrating hoppers (23) assembled on the two inflow pipe orifices (212).

10. The composite artificial fish reef device according to claim 8, characterized in that: A main body air curtain control valve is provided for the main body air curtain generating pipe fitting (3), and a side air curtain control valve is provided for the side air curtain generating pipe fitting (6).

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